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Goodwill and Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | $ 1,898,586
Accumulated goodwill impairment losses |  | (200,631)
Goodwill [Roll Forward] |  |
Balance at December 31, 2018 | $ 1,697,955 |
Foreign currency translation | (21,100) |
Acquisitions | 97,352 |
Acquisition adjustments | 183 |
Balance at September 30, 2019 | 1,774,390 |
FMT |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | 601,762
Accumulated goodwill impairment losses |  | (20,721)
Goodwill [Roll Forward] |  |
Balance at December 31, 2018 | 581,041 |
Foreign currency translation | (4,797) |
Acquisitions | 0 |
Acquisition adjustments | 0 |
Balance at September 30, 2019 | 576,244 |
HST |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | 895,177
Accumulated goodwill impairment losses |  | (149,820)
Goodwill [Roll Forward] |  |
Balance at December 31, 2018 | 745,357 |
Foreign currency translation | (10,083) |
Acquisitions | 97,352 |
Acquisition adjustments | 183 |
Balance at September 30, 2019 | 832,809 |
FSDP |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | 401,647
Accumulated goodwill impairment losses |  | $ (30,090)
Goodwill [Roll Forward] |  |
Balance at December 31, 2018 | 371,557 |
Foreign currency translation | (6,220) |
Acquisitions | 0 |
Acquisition adjustments | 0 |
Balance at September 30, 2019 | $ 365,337 |

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